Vertiv Cabinet Shelf 19IN EIA 24-29 in Deep - ESF24-29

Vertiv ESF24-29 Equipment Support Frame for 19-Inch EIA Racks

The Vertiv ESF24-29 is a 1U equipment support frame engineered for mid-to-deep 19-inch EIA racks, providing a rigid, recessed mounting platform where standard fixed shelves either lack the depth or can't handle the load. At 17.75 inches wide and adjustable from 24 to 26 inches deep, the ESF24-29 bridges the gap between shallow utility shelves and purpose-built equipment rails — delivering 300 lbs of rated capacity in a single rack unit of vertical space.

Overview

Where a conventional shelf sits on the rail face, the ESF24-29 mounts recessed between the front and rear uprights, requiring attachment to both front and rear mounting rails. That recessed position keeps the frame flush within the rack envelope — important in dense rows where protruding hardware creates aisle clearance issues or conflicts with blanking panels and cable management. The 300 lb weight rating makes it practical for heavier passive equipment, UPS modules, or consolidation of multiple smaller units that would otherwise require a dedicated equipment bay.

Key Features

• 300 lb weight capacity at 1 RMU: Most standard 1U fixed shelves are rated at 60–150 lbs. The ESF24-29's 300 lb rating at a single rack unit means you can mount dense, heavy equipment — think transformer-backed PDU modules or multi-drive storage chassis — without surrendering two or three RUs to a heavier shelf structure.
• 17.75" width x 24-26" adjustable depth: The depth range accommodates equipment footprints that vary by configuration or cabling — you're not locked into a single fixed depth. The 17.75" width fits standard 19" EIA rail spacing with proper clearance for equipment ears and fasteners.
• Recessed rack-mount design: Mounting to both front and rear uprights distributes load across the full rack structure rather than cantilevering weight off the front rails. This matters when the rack is not bolted to the floor or when you're stacking heavy equipment across multiple RUs.
• 1 RMU profile: A single rack unit consumed by the support frame itself keeps vertical space overhead for equipment above. Compare to 2U sliding shelves that eat rack real estate even when not in use.
• Front and rear upright requirement: The ESF24-29 must mount to both front and rear mounting rails — a design constraint that also ensures structural rigidity. Verify your rack has accessible rear uprights before ordering; open-frame racks without rear rails are not compatible.
• 19" EIA compatibility: Designed for standard EIA-310 19-inch rack systems, making it compatible with the broad installed base of Vertiv, APC, Middle Atlantic, and equivalent open-frame and enclosed rack enclosures that follow the standard hole pattern.

Integration and Compatibility

The ESF24-29 (often searched as ESF24 29) is part of Vertiv's rack accessories ecosystem, which includes companion components such as the FMSBKT front mount support brackets (150 lb, 1 RMU) for lighter front-only installs, and the ESF21-32 for deeper equipment footprints up to 32 inches. For installations requiring a fixed shallow shelf, Vertiv's 7206-series stationary shelves cover 18" through 32" depth in the same 19" EIA format. When pairing with Vertiv rack infrastructure, confirm whether your enclosure provides rear-upright access — enclosed cabinets with rear door interference may require door removal or offset brackets during installation. This frame integrates into the same rack accessories family as Vertiv's PDU mounting brackets (PDU2ER, PDU3ER) and vertical cable bars (VPCB1), making it straightforward to spec within an existing Vertiv rack build. For teams planning full rack layouts, a rack planning and capacity guide can help sequence equipment placement before physical installation begins. If your load requirements exceed 300 lbs or you need sliding access, evaluate Vertiv's rack shelf lineup for sliding variants or higher-capacity fixed options in the same product family.

Frequently Asked Questions

Q: What is the weight capacity of the ESF24-29?

A: The ESF24-29 is rated at 300 lbs weight capacity at 1 RMU.

Q: Does the ESF24-29 require mounting to both front and rear rack uprights?

A: Yes. The ESF24-29 must mount to both front and rear mounting rails/uprights. It is not compatible with front-rail-only or wall-mount configurations.

Q: What rack width is the ESF24-29 designed for?

A: The ESF24-29 is designed for standard 19-inch EIA rack systems, with a frame width of 17.75 inches.

Q: What depth range does the ESF24-29 cover?

A: The ESF24-29 spans 24 to 26 inches in depth, accommodating equipment with varying footprint dimensions in that range.

Q: How does the ESF24-29 differ from the ESF21-32?

A: The ESF21-32 covers a deeper range (21-32 inches) and shares the same 300 lb / 1 RMU rating. Choose the ESF24-29 when your equipment depth falls in the 24-26 inch window; choose the ESF21-32 for deeper chassis.

Jerry Tildsen

The ESF24-29 addresses a specific gap in rack hardware spec: a 300 lb rated support frame in a single rack unit, recessed between front and rear uprights. Most integrators reach for a standard fixed shelf and then discover mid-project that it's rated at 60-150 lbs and sits proud of the rail face. The ESF24-29 eliminates both problems — the weight rating handles real-world consolidated equipment loads, and the recessed mount keeps the rack profile clean.

Technical Highlights:

• 300 lb capacity at 1 RMU: Twice to five times the capacity of comparable-height fixed shelves in the Vertiv lineup — critical when mounting power conditioning or multi-unit passive equipment.
• 24-26" adjustable depth: Covers the mid-depth equipment window that falls between standard 18" shallow shelves and 32"+ deep-chassis frames, without requiring a custom bracket solution.
• Dual-upright mount: Load distributes across the full rack structure, not cantilevered off front rails — the right call for any rack that isn't floor-anchored or carries top-heavy equipment stacks.

Deployment Considerations:

• Confirm rear upright access before ordering. Enclosed cabinets with a rear door closer than 26" to the front rail plane may require door removal during installation — budget the labor time accordingly.
• The ESF24-29 is a 1 RMU frame, but the equipment it supports will consume additional RUs above it. Plan your rack elevation drawing before committing to placement — particularly in high-density rows where RU count is already tight.

The ESF24-29 is the right call for network operations centers and security head-end rooms where rack space is at a premium and equipment loads regularly exceed what commodity shelves handle — specifically, any 24-26" deep chassis that needs a solid, load-rated platform without sacrificing two or more rack units to get it.